The video is a bit of a letdown. I have an OG Xbox with thousands of games installed and I know one day it will die, so it's good news there's hope for emulation.
However, after watching the games he showcased as playable, there are some weird frame hitch going for all of them, or outright framerate issues. Rally Sport is a good example. It literally still runs better on original hardware than the video he just showed. Whereas something like Dolphin or Redream for Dreamcast, adds to the experience in most cases.
Progress is progress though.